Page 1
NO.:
ISSUED:
73120
Sep. 21, 2004
HOSHIZAKI
STACKABLE CRESCENT CUBER
MODEL
KM-1600SWH
KM-1600SRH
KM-1600SWH3
KM-1600SRH3
SERVICE MANUAL
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IMPORTANT
Only qualified service technicians should attempt to service or maintain this
icemaker. No service or maintenance should be undertaken until the technician
has thoroughly read this Service Manual.
HOSHIZAKI provides this manual primarily to assist qualified service technicians in the
service and maintenance of the icemaker.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call or write to the HOSHIZAKI Technical Support Department for
assistance.
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: HOSHIZAKI Technical Support Department
Phone: 1-800-233-1940 Technical Service
(770) 487-2331
Fax: (770) 487-3360
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem
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Please review this manual. It should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified service technicians should service
and maintain the icemaker. This manual should be made available to the technician prior to
service or maintenance.
CONTENTS
I. Specifications .................................................................................................................... 5
1. Icemaker ....................................................................................................................... 5
[a] KM-1600SWH ....................................................................................................... 5
[b] KM-1600SRH ........................................................................................................ 6
[c] KM-1600SWH3 ..................................................................................................... 7
[d] KM-1600SRH3 ...................................................................................................... 8
2. Condensing Unit........................................................................................................... 9
URC-20F.................................................................................................................... 9
II. General Information ........................................................................................................ 11
1. Construction ............................................................................................................... 11
[a] KM-1600SWH, KM-1600SWH3 .......................................................................... 11
[b] KM-1600SRH, KM-1600SRH3 ............................................................................ 12
2. Controller Board ......................................................................................................... 13
[a] Solid-State Control .............................................................................................. 13
[b] Controller Board .................................................................................................. 13
[c] Sequence ............................................................................................................ 17
[d] Controls and Adjustments ................................................................................... 20
[e] Checking the Controller Board ............................................................................ 23
III. Technical Information ..................................................................................................... 25
1. Water Circuit and Refrigerant Circuit........................................................................... 25
[a] KM-1600SWH, KM-1600SWH3 .......................................................................... 25
[b] KM-1600SRH, KM-1600SRH3 ............................................................................ 26
2. Wiring Diagrams ......................................................................................................... 27
[a] KM-1600SWH, KM-1600SRH ............................................................................. 27
[b] KM-1600SWH3, KM-1600SRH3 ......................................................................... 28
3. Timing Chart ............................................................................................................... 29
4. Performance Data ....................................................................................................... 31
[a] KM-1600SWH ..................................................................................................... 31
[b] KM-1600SRH ...................................................................................................... 32
[c] KM-1600SWH3 ................................................................................................... 33
[d] KM-1600SRH3 .................................................................................................... 34
IV. Service Diagnosis .......................................................................................................... 35
1. No Ice Production ....................................................................................................... 35
2. Evaporator is Frozen Up ............................................................................................. 39
3. Low Ice Production ..................................................................................................... 40
4. Abnormal Ice .............................................................................................................. 40
5. Other ........................................................................................................................... 40
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V. Removal and Replacement of Components ................................................................... 41
1. Service for Refrigerant Lines ...................................................................................... 41
[a] Refrigerant Recovery........................................................................................... 41
[b] Evacuation and Recharge [R-404A] .................................................................... 41
2. Brazing ....................................................................................................................... 42
3. Removal and Replacement of Compressor ................................................................ 43
4. Removal and Replacement of Drier ........................................................................... 44
5. Removal and Replacement of Expansion Valve......................................................... 45
6. Removal and Replacement of Hot Gas Valve and Line Valve .................................... 46
7. Removal and Replacement of Evaporator .................................................................. 47
8. Removal and Replacement of Water Regulating Valve - Water-Cooled Model Only... 48
9. Adjustment of Water Regulating Valve - Water-Cooled Model Only ............................ 49
10. Removal and Replacement of Condensing Pressure Regulator (C.P.R.) -
Remote Air-Cooled Model Only ............................................................................... 50
11. Removal and Replacement of Thermistor ................................................................ 51
12. Removal and Replacement of Fan Motor ................................................................. 52
13. Removal and Replacement of Water Valve............................................................... 53
14. Removal and Replacement of Pump Motor .............................................................. 53
15. Removal and Replacement of Spray Tubes.............................................................. 54
VI. Maintenance and Cleaning Instructions ........................................................................ 55
1. Preparing the Icemaker for Long Storage ................................................................... 55
2. Cleaning and Sanitizing Procedures .......................................................................... 57
[a] Cleaning Procedure ............................................................................................ 58
[b] Sanitizing Procedure - Following Cleaning Procedure ....................................... 60
3. Maintenance ............................................................................................................... 61
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I. Specifications
1. Icemaker
[a] KM-1600SWH
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION Ambient
PER 24 HR. Temp.(°F) 50 70
lbs./day ( kg/day ) 70 *1551 (704) 1553 (704)
Reference without *marks 80 1553 (704) 1556 (706)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 30.9 lbs. (14 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & W ATER CONSUMPTION 90/ 70°F 70/50°F
ELECTRIC W (kW H/100 lbs.) 2727 (4.2) 2650 (4.1)
POTABLE WATER 394 (25.3) 693 (44.7)
WATER COOLED CONDENSER 1246 (80) 744 (48)
gal./24HR (gal./100 lbs .)
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT Cond. Inlet
- DRAIN Outlet 3/4" FPT Cond. Outlet
CUBE CONTROL SYSTEM Float S wit ch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WA TER CONTROL Water Regulator
BIN CONTROL SYSTEM Thermos tat
COMPRESSOR Hermetic, Model CS20K6E-PFV-237
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 3 lb. 1 oz. ( 1400 g )
DESIGN PRESSURE High 427 PSIG, Low 230 PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERA NT CIRCUIT PROTECTION Auto-reset High Pressure Control S witch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE
208-230/60/1 (3 wire with neutral for 115V)
15 A ( 5 Min. Freeze AT 104°F / WT 80°F)
30 A
30 A
WATER TEMP. (°F)
90 1553 (704) *1558 (707)
100 1507 (683) 1531 (695)
48" x 27-3/8" x 27 3/8" (1219 x 695 x 695 mm)
Stainless Steel, Galvanized Steel (Rear)
Net 310 lbs. ( 141 kg ), Shipping 360 lbs. (163 kg)
3/8" OD Pipe
AMBIENT TEMP.
WATER SUPPLY TEMP.
WATER SUPPLY PRESSURE
90
1468 (666)
1422 (645)
1443 (655)
1338 (607)
1/2" FPT
1/2" FPT
187 - 253 V
45 -100° F
45 - 90° F
10 - 113 PSIG
We reserve the right to make changes in specifications and design without prior notice.
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[b] KM-1600SRH
AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 21 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 30 A
MAXIMUM FUSE SIZE 30 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *1430 (649) 1421 (645) 1343 (609)
Reference without *marks 80 1423 (646) 1410 (639) 1295 (588)
90 1421 (645) *1400 (635) 1299 (589)
100 1383 (628) 1376 (624) 1207 (547)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 30.9 lbs. (14 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 3267 (5.6) 2815 (4.7)
WATER gal./24HR (gal./100 lbs.) 473 (33.8) 841 (58.8)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 27 3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 285 lbs. ( 129 kg ), Shipping 360 lbs. ( 163 kg )
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
- CONDENSATE DRAIN 3/8" OD Pipe
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WA TER CONTROL N/A
BIN CONTROL SYSTEM Thermos tat
COMPRESSOR Hermetic, Model CS20K6E-PFV-279
CONDENSER Air-cooled remote, Condenser Unit URC-20F recommended
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-20F
REFRIGERANT CHARGE R-404A, 14 lbs. 12 oz. ( 6700 g )
( Icemaker 7 lbs.1 oz.; Cond. Unit 7 lbs. 11 oz. )
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
P. C. BOARD CIRCUIT PROTECTION High V oltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
We reserve the right to make changes in specifications and design without prior notice.
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[c] KM-1600SWH3
AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 9.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *1500 (680) 1514 (687) 1451 (658)
Reference without *marks 80 1510 (685) 1532 (695) 1423 (646)
90 1514 (687) *1547 (702) 1456 (661)
100 1473 (668) 1526 (692) 1373 (623)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 30.9 lbs. (14 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2643 (4.1) 2563 (4.1)
POTABLE WATER 467 (30.2) 887 (59.1)
WATER COOLED CONDENSER 1640 (106) 1005 (67)
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27-3/8" x 27 3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 310 lbs. ( 141 kg ), Shipping 360 lbs. (163 kg)
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT Cond. Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT Cond. Outlet 1/2" FPT
3/8" OD Pipe
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WA TER CONTROL Water Regulator
BIN CONTROL SYSTEM Thermos tat
COMPRESSOR Hermetic, Model CS20K6E-TF5-237
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 3 lb. 1 oz. ( 1400 g )
DESIGN PRESSURE High 427 PSIG, Low 230 PSIG
P. C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Int ernal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
We reserve the right to make changes in specifications and design without prior notice.
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[d] KM-1600SRH3
AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 11 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *1461 (663) 1436 (651) 1365 (619)
Reference without *marks 80 1442 (654) 1403 (636) 1311 (595)
90 1436 (651) *1375 (624) 1291 (585)
100 1409 (639) 1355 (615) 1213 (550)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 30.9 lbs. (14 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2865 (5.0) 2775 (4.6)
WATER gal./24HR (gal./100 lbs.) 436 (31.7) 773 (52.9)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 27 3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 285 lbs. ( 129 kg ), Shipping 360 lbs. ( 163 kg )
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
- CONDENSATE DRAIN 3/8" OD Pipe
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WA TER CONTROL N/A
BIN CONTROL SYSTEM Thermos tat
COMPRESSOR Hermetic, Model CS20K6E-TF5-279
CONDENSER Air-cooled remote, Condenser Unit URC-20F recommended
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-20F
REFRIGERANT CHARGE R-404A, 14 lbs. 12 oz. ( 6700 g )
( Icemaker 7 lbs 1 oz.; Cond. Unit 7 lbs. 11 oz. )
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
P. C. BOARD CIRCUIT PROTECTION High V oltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
We reserve the right to make changes in specifications and design without prior notice.
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2. Condensing Unit
URC-20F
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MODEL: URC-20F
SPECIFICATIONS
EXTERIOR
DIMENSIONS (W x D x H)
REFRIGERANT CHARGE
URC-20F
WEIGHT
CONNECTIONS
REFRIGERANT
ELECTRICAL
CONDENSER
HEAD PRESSURE CONTROL
AMBIENT CONDITION
Galvanized Steel
46 - 3/8" x 15 - 11/16" x 25 - 15/16"
(1178 x 398 x 659 mm)
R404A 7 lbs.11 oz. (3500 g)
Net 104 lbs. (47 kg)
Shipping 115 lbs. (52 kg)
One Shot Couplings (Aeroquip)
Permanent Connection
Air-cooled
Condensing Pressure Regulator
Min. -20°F - Max. +122°F
(-29°C to +50°C)
Outdoor use
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II. General Information
1. Construction
[a] KM-1600SWH, KM-1600SWH3
Evaporator Spray Tube Water Valve
Water Supply Inlet
Expansion Valve
Hot Gas Valve
Junction Box
Water-cooled
Condenser
Check Valve
Control Box
Water Regulator
Water Pump
Float Switch Drier
Cleaning Valve Line Valve
Compressor Transformer Box
(KM-1600SWH3)
Control Switch Bin Control Thermostat Capacitor Box
(KM-1600SWH)
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[b] KM-1600SRH, KM-1600SRH3
Evaporator Spray Tube Water Valve
Expansion Valve
Water Supply Inlet
Hot Gas Valve
Junction Box
Check Valve
Control Box
Receiver Tank
Water Pump
Float Switch Drier
Cleaning Valve Line Valve
Compressor Transformer Box
(KM-1600SRH3)
Control Switch Bin Control Thermostat Capacitor Box
(KM-1600SRH)
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2. Controller Board
[a] Solid-State Control
1) A HOSHIZAKI exclusive solid-state control is employed in KM-1600SWH,
KM-1600SRH, KM-1600SWH3, and KM-1600SRH3 Stackable Crescent Cubers.
2) A printed circuit board (hereafter called “controller board”) includes a stable and high
quality control system.
3) All models are pretested and factory-adjusted.
[b] Controller Board
CAUTION
1. Fragile, handle very carefully.
2. A controller board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the metal
part of the unit when handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the board to
prevent damage to the board.
4. Do not change wiring and connections. Do not misconnect K3, K4 and K5,
because the same connector is used for the thermistor and float switch. K4
is not connected.
5. Always replace the whole board assembly when it goes bad.
6. Do not short out power supply to test for voltage.
Part Number Type
2A1410-01 HOS-001A (Control Products - 10 Pin)
Features of Control Products “E” Controller Board
1) Maximum Water Supply Period - 6 minutes
Water solenoid valve opening in the defrost (harvest) cycle is limited by the defrost
timer. The water valve cannot remain open longer than the maximum period. The water
valve can close in less than six minutes if the defrost cycle is completed.
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2) Defrost Timer
The defrost cycle starts when the float switch opens and completes the freeze cycle. But
the defrost timer does not start counting until the thermistor senses 48°F at the
evaporator outlet. The period from the end of the freeze cycle up to the point of the
thermistor's sensing varies depending on the ambient and water temperatures.
3) High Temperature Safety - 127 ± 7°F
The temperature of the suction line in the refrigerant circuit is limited by the high
temperature safety. During the defrost cycle the evaporator temperature rises. The
thermistor senses 48°F and starts the defrost timer. After the defrost timer counts down to
zero, the normal freeze cycle begins. If the evaporator temperature continues to rise, the
thermistor will sense the rise in temperature and at 127 ± 7°F the thermistor operates the
high temperature safety. This high temperature safety shuts down the circuit and the
icemaker automatically stops. To reset the safety, turn the power off and back on again.
This high temperature safety protects the unit from excessive temperature. The control
board will beep every 3 seconds. The white reset button on the control board must be
pressed with power on to reset the safety.
4) Low Water Safety
If the pump motor is operated without water, the mechanical seal can fail. To prevent this
type of failure, the controller board checks the position of the float switch at the end of the
initial one minute water fill cycle and at the end of each defrost cycle.
If the float switch is in the up position (electrical circuit closed), the controller board
changes to the ice making cycle. If the float switch is in the down position (electrical
circuit open), the controller board changes to a one minute water fill cycle before starting
the ice making cycle. This method allows for a low water safety shut down to protect the
water pump from mechanical seal failure.
For water-cooled models, if the water is shut off, the unit is protected by the high
pressure switch.
5) High Voltage Cut-out
The maximum allowable supply voltage of this icemaker is limited by the high voltage
cut-out. If miswiring (especially on single-phase, 3-wire models) causes excessive
voltage on the controller board, the high voltage cut-out shuts down the circuit in
3 seconds and the icemaker automatically stops. When the proper supply voltage is
resumed, the icemaker automatically starts running again. The control board will signal
this problem using 7 beeps every 3 seconds.
6) LED Lights and Audible Alarm Safeties
The red LED indicates proper control voltage and will remain on unless a control voltage
problem occurs. At startup a 5 second delay occurs while the board conducts an internal
timer check. A short beep occurs when the power switch is turned ON or OFF.
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The green LED’s 1-4 represent the corresponding relays and energize and sequence 5
seconds from initial startup as follows:
Sequence Step LED’s on Length: Min. Max. Avg.
1 Minute Fill Cycle LED4 60 sec.
Harvest Cycle LED1, 4, & 2 2 min. 20 min. 3-5 min.
Freeze Cycle LED1 5 min. 60 min. 30-35 min.
Reverse Pump Out LED1, 3, & 2 10 sec. 20 sec. Factory set.
{LED 1 – Comp; LED 2 - HGV/CFM; LED 3 – PM; LED 4 - WV}
The built in safeties shut down the unit and have alarms as follows:
1 beep every 3 sec. = High Evaporator Temperature >127 ° F.
Check for defrost problem (stuck HGV or relay), hot water entering unit, stuck headmaster,
or shorted thermistor.
2 beeps every 3 sec. = Defrost Back Up Timer. Defrost >20 minutes.
Orange LED marked 20 MIN energizes.
Check for open thermistor, HGV not opening, TXV leaking by, low charge, or inefficient
compressor.
3 beeps every 3 sec. = Freeze Back Up Timer. Freeze > 60 minutes.
Yellow LED marked 60 MIN energizes.
Check for F/S stuck closed (up), WV leaking by, HGV leaking by, TXV not feeding properly, low charge, or inefficient compressor.
To manually reset the above safeties, press white alarm reset button with the power supply
ON.
6 beeps every 3 sec. = Low Voltage. Voltage is 92 Vac or less.
7 beeps every 3 sec. = High Voltage. Control voltage > 147Vac ±5%.
The red LED will de-energize if voltage protection operates.
The voltage safety automatically resets when voltage is corrected.
The Output Test switch “S3” provides a relay sequence test. With power OFF, place S3
ON and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, & 4,
normal sequence every 5 seconds. S3 should remain in the “OFF” position for normal
operation.
The application switch located between relay X3 & X4 must be set to match the original
board application. Place this switch in the ALP position if there is no white wire supplied to
the K1 connector. If there is a white wire, place the switch in the C position. If this switch is
placed in the wrong position either the compressor contactor will remain energized with the
control switch OFF or the unit will not start.
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The dip switches should be adjusted per the adjustment chart published in the Tech
Specs book. 7 & 8 must remain in the OFF position.
(Control Products HOS-001A Board)
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[c] Sequence
1st Cycle
1. Unit energized and control switch to “ICE”
position. Water supply cycle starts.
2. After 1 minute.
defrost cycle starts.
3. Thermistor reads 48°F.
Defrost timer starts counting.
5. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when float
switch circuit opens.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
IMPORTANT
Water valve
opening is limited
to 6 minutes.
4. Defrost timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts defrost completion signal
within the first 2 minutes in defrost cycle.
2. Defrost cycle time is limited to 20 minutes even
if defrost timer does not stop counting.
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2nd Cycle and after with pump drain
IMPORTANT
Freeze cycle time is limited by the freeze timer
factory setting even if float switch does not open.
1. Float switch opens and signals to complete
freeze cycle.
Drain timer starts counting.
&
2. Drain timer stops counting.
Pump drain is completed
3. Thermistor reads 48° F.
Defrost timer starts
counting.
IMPORTANT
Water valve
opening is limited to 6
minutes.
5. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when Float
Switch circuit opens.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
4. Defrost Timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. Defrost cycle time is limited to 20 minutes
even if defrost timer does not stop counting.
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2nd Cycle and after with no pump drain
IMPORTANT
Freeze cycle time is limited by the freeze timer
factory setting even if float switch does not open.
1. Float switch opens and signals to complete
freeze cycle.
2. Thermistor reads 48° F.
Defrost timer starts counting.
IMPORTANT
Water valve
opening is limited to 6
minutes.
4. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when float
switch circuit opens.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
3. Defrost timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. Defrost cycle time is limited to 20 minutes
even if defrost timer does not stop counting.
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[d] Controls and Adjustments
The dip switch is factory-adjusted to the following positions:
DIP SWITCH NO.12345678910
KM-1600SWH
KM-1600SWH3
KM-1600SRH
KM-1600SRH3
OFF OFF OFF OFF OFF
OFF OFF OFFONOFFONONONONOFF
ONOFF OFF OFF OFF
Switch Nos. 1 and 2:
Used for adjustment of the defrost timer.
The defrost timer starts counting when the thermistor reads a certain temperature
at the evaporator outlet.
Switch Nos. 3 and 4:
Used for adjustment of the drain timer.
When a freeze cycle is completed, the pump motor stops and the icemaker
resumes operation in 2 seconds. Then the pump motor drains the water tank
for the time determined by the drain timer. The drain timer also determines
the time to restrain completion of a defrost cycle, i.e. the minimum defrost time.
Switch Nos. 5 and 6:
Used for adjustment of the drain counter.
The pump motor drains the water tank at the frequency determined by the drain
counter.
Switch Nos. 7 and 8:
Used only for checking the controller board. Usually set in OFF position.
Switch Nos. 9 and 10:
Used for adjustment of freeze timer.
The freeze timer determines maximum
freeze cycle time. Upon termination of
freeze timer, machine initiates the
harvest cycle. After 2 consecutive timer
terminations, machine will shut down,
possibly indicating a problem.
20
Page 21
1) Defrost Control
A thermistor (semiconductor) is used for a defrost control sensor. The resistance varies
depending on the suction line temperatures. The thermistor detects the temperature of
the evaporator outlet to start the defrost timer. No adjustment is required. If necessary,
check for resistance between thermistor leads and visually check the thermistor
mounting, located on the suction line next to the evaporator outlet.
Temperature (°F) Resistance (kΩ)
0 14.401
10 10.613
32 6.000
50 3.871
70 2.474
90 1.633
Check a thermistor for resistance by using the following procedure:
(i) Disconnect the connector K3 on the board.
(ii) Remove the thermistor. See “V. 11. Removal and Replacement of Thermistor”.
(iii) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3
minutes.
(iv) Check for a resistance between thermistor leads.
Normal reading is within 3.5 to 7 kΩ. Replace the thermistor if it exceeds the normal
reading.
2) Defrost Timer
No adjustment is required under normal use, as the defrost timer is adjusted to the
suitable position. However, if necessary, when all the ice formed on the evaporator does
not fall into the bin in the harvest cycle, adjust the defrost timer to a longer setting by
adjusting the dip switch (No. 1 & 2) on the controller board.
SETTING TIME
Dip Switch Dip Switch
No. 1 No. 2
OFF OFF 60 seconds
ON OFF 90 seconds
OFF ON 120 seconds
ON ON 180 seconds
21
Page 22
3) Drain Timer
The drain timer is factory-adjusted, and no adjustment is required.
SETTING TIME
Dip Switch Dip Switch
No. 3 No. 4 T1 T2
OFF OFF 10 seconds 150 seconds
ON OFF 10 seconds 180 seconds
OFF ON 10 seconds 120 seconds
ON ON 20 seconds 180 seconds
T1: Time to drain the water tank
T2: Time to restrain defrost completion
4) Drain Counter
CAUTION
Do not adjust the drain counter, or the evaporator may freeze up.
The drain counter is factory-adjusted to drain the water tank every 10 cycles and no
adjustment is required. However, where water quality is bad and the icemaker needs a
pump drain more often, the drain counter can be adjusted as shown in the table below.
SETTING FREQUENCY
Dip Switch Dip Switch
No. 5 No. 6
OFF OFF every cycle
ON OFF every 2 cycles
OFF ON every 5 cycles
ON ON every 10 cycles
22
Page 23
5) Freeze Timer
CAUTION
Adjust to proper specification or the unit may not operate correctly.
The freeze timer is factory adjusted and no adjustment is required. This setting
determines the maximum allowed freeze time to prevent possible freeze-up issues.
SETTING TIME
Dip Switch Dip Switch
No. 9 No. 10
OFF OFF 60 min.
ON OFF 70 min.
OFF ON 50 min.
ON ON 60 min.
6) Bin Control
CAUTION
When the ambient temperature is below 45°F, the bin control thermostat
operates to stop the icemaker even if the ice storage bin is empty. When the
thermostat is set in the prohibited range, the icemaker operates continuously
even if the ice storage bin is filled with ice. Setting in the prohibited range
might cause severe damage to the icemaker resulting in failure.
No adjustment is required under normal use, as the bin control is factory-adjusted.
Adjust it, if necessary, so that the icemaker stops automatically within 10 seconds
after ice contacts the bin control thermostat bulb.
[e] Checking the Controller Board
1) Visually check the sequence with the icemaker operating.
2) Visually check the controller board by using the following procedure:
(i) Adjust the defrost timer to minimum position.
Disconnect the thermistor from the controller board.
Connect a 1.5 kΩ - 3.5 kΩ resistor to the connector K3 (pins #1 and #2), and energize
the unit.
After the 1 minute ± 5 second water supply cycle and the 2 minute ± 10 second defrost
cycle, the unit should start the freeze cycle.
23
Page 24
(ii) After the above step (i), disconnect the float switch leads from the controller board within
the first 5 minutes of the freeze cycle.
The unit should go into the defrost cycle after the first 5 minutes ± 20 seconds of the
freeze cycle.
(iii) Reconnect the float switch connector to the controller board. After the first 5 minutes
of the freeze cycle, disconnect the float switch leads from the controller board.
At this point, the unit should start the defrost cycle.
(iv) After step (iii), de-energize the unit and confirm that the defrost timer is in the mini-
mum position. Disconnect the resistor from the controller board and energize the
unit.
After the 1 minute water supply cycle, the defrost cycle starts.
Re-connect a 1.5 kΩ - 3.5 kΩ resistor to the connector K3 (pins #1 and #2) after the
first 2 minutes of the defrost cycle.
The unit should start the freeze cycle after 1 minute ± 5 seconds from the resistor
connection.
3) Check the controller board by using test program of the controller board.
The output test switch “S3” provides a relay sequence test. With power OFF, place S3
ON and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1,
and 4, normal sequence every 5 seconds. S3 should remain in the “OFF” position for
normal operation.
24
Page 25
III. Technical Information
1. Water Circuit and Refrigerant Circuit
[a] KM-1600SWH, KM-1600SWH3
25
Page 26
[b] KM-1600SRH, KM-1600SRH3
26
Page 27
2. Wiring Diagrams
[a] KM-1600SWH, KM-1600SRH
KM-1600SWH
Pressure Switch
Cut-out 384 PSIG
+ 21.3
- 0
Cut-in 285 ± 21.3 PSIG
KM-1600SRH
Pressure Switch
Cut-out 412 PSIG
Cut-in 327 ± 21.3 PSIG
27
+ 21.3
- 0
Page 28
[b] KM-1600SWH3, KM-1600SRH3
KM-1600SWH3
Pressure Switch
Cut-out 384 PSIG
+ 21.3
- 0
Cut-in 285 ± 21.3 PSIG
KM-1600SRH3
Pressure Switch
28
Cut-out 412 PSIG
+ 21.3
- 0
Cut-in 327 ± 21.3 PSIG
Page 29
3. Timing Chart
29
Page 30
30
Page 31
4. Performance Data
[a] KM-1600SWH
APPROXIMATE ICE
PRODUCTION PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts 100/38
APPROXIMATE WATER
CONSUMPTION P ER 24 HR.
gal./day m3/day 100/38 1693 6.41 1765 6.68 2662 10.08
FREEZING CYCLE TIME
min. 100/38
HARVEST CYCLE TIME
min. 100/38
HEA D PRE SSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG kg/cm2G
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27 1553 704 1556 706 1422 645
90/32 1553 704
100/38 1507 683 1531 695 1338 607
70/21
80/27
90/32
70/21
80/27 1482 5.61 1575 5.96 2177 8.24
90/32 1496 5.66
70/21
80/27
90/32
70/21
80/27
90/32
70/21
80/27 271 19.1 272 19.1 277 19.5
90/32 272 19.1
100/38 273 19.2 274 19.3 281 19.8
70/21
80/27 40 2.8 42 2.9 44 3.1
90/32 40 2.8
100/38 41 2.9 44 3.1
50/10 70/21 90/32
1551
2650
2667
2672
2655
1437
24
24
25
25
4.7
4.3
4.1
3.8
271
39
WATER TEMP. (ºF/ºC)
704 1553 704 1468 666
1558
5.44
19.1
2.7 40 2.8 42 3.0
1496 5.66 1913 7.24
1640
272 19.1 275 19.3
273
43
707
2672
2702
2727
2720
6.21
25
25
26
26
4.1
3.8
2.7
2.7
19.2
3.0
1443 655
2660
2666
2700
2676
2173 8.22
26
28
28
30
3.9
3.5
2.7
2.7
277 19.5
46 3.2
48
3.4
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 3170 BTU/h [AT 90ºF (32ºC) / W T 70ºF (21ºC)]
WATER FLOW FOR CONDENSER 96 gal. / h (AT 100ºF (38ºC) / W T 90ºF (32ºC))
PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG
18220 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
Note: Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior notice.
31
Page 32
[b] KM-1600SRH
APPROXIMATE ICE
PRODUCTION PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts 100/38
APPROXIMATE WATER
CONSUMPTION P ER 24 HR.
gal./day m3/day 100/38 729 2.76 453 1.71 304 1.15
FREEZING CYCLE TIME
min. 100/38
HARVEST CYCLE TIME
min. 100/38
HEA D PRE SSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG kg/cm2G 100/38 40 2.8 43 3.1 47 3.3
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27 1423 646 1410 639 1295 588
90/32 1421 645
100/38 1383 628 1376 624 1207 547
70/21
80/27
90/32
70/21
80/27 759 2.87 591 2.24 516 1.95
90/32 733 2.78
70/21
80/27
90/32
70/21
80/27
90/32
70/21
80/27 233 16.4 249 17.5 273 19.2
90/32 235 16.5
100/38 242 17.0 265 18.7 305 21.4
70/21
80/27 39 2.8 41 2.9 43 3.1
90/32 39 2.8
50/10 70/21 90/32
1430
2815
2916
2947
3204
841
25
26
26
26
5.5
4.9
4.8 2.7
3.9
225
38
W ATER TEMP. (ºF/ º C)
649 1421 645 1343 609
1400
3.18
15.8
2.7 39 2.8 41 2.9
733 2.78 632 2.39
473
235 16.5 256 18.0
260
43
635
2947
3121
3267
3277
1.79
26
27
28
28
4.8
3.8
3.0
2.9
18.3
3.0
1299 589
3023
3138
3310
3350
385 1.46
28
29
30
32
4.3
3.7
2.5
283 19.9
45 3.2
TOTAL HEAT OF REJECTION FROM CONDENSER 19250 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR 3225 BTU/h [AT 90ºF (32ºC) / W T 70ºF (21ºC)]
CONDENSER VOLUME 214 CU. IN (URC-20F)
Note: Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior notice.
32
Page 33
[c] KM-1600SWH3
APPROXIMATE ICE
PRODUCTION PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts 100/38
APPROXIMATE WATER
CONSUMPTION P ER 24 HR.
gal./day m3/day 100/38 2348 8.89 2348 8.89 4078 15.44
FREEZING CYCLE TIME
min. 100/38
HARVEST CYCLE TIME
min. 100/38
HEA D PRE SSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG kg/cm2G
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27 1510 685 1532 695 1423 646
90/32 1514 687
100/38 1473 668 1526 692 1373 623
70/21
80/27
90/32
70/21
80/27 1940 7.34 2038 7.71 3213 12.16
90/32 1955 7.40
70/21
80/27
90/32
70/21
80/27
90/32
70/21
80/27 271 19.1 273 19.2 276 19.4
90/32 271 19.1
100/38 272 19.1 276 19.4 280 19.7
70/21
80/27 41 2.9 42 3.0 45 3.2
90/32 41 2.9
100/38 42 2.9 44 3.1
50/10 70/21 90/32
1500
2563
2580
2586
1892
24
24
25
25
5.0
4.4
4.3
3.4
270
40
W ATER TEMP. (ºF/ º C)
680 1514 687 1451 658
1547
7.16
19.0
2.8 41 2.9 43 3.0
1955 7.40 2741 10.38
2107
271 19.1 274 19.3
275
43
702
2586
2617
2643
2655
7.98
25
25
26
26
4.3
3.3
2.5
2.4
19.3
3.0
1456 661
2634
2673
2697
27462601
3134 11.86
26
26
27
28
3.8
3.2
2.2
2.0
278 19.5
46 3.2
48
3.4
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 3100 BTU/h [AT 90ºF (32ºC) / W T 70ºF (21ºC)]
WATER FLOW FOR CONDENSER 155 gal. / h (AT 100ºF (38ºC) / WT 90ºF (32ºC))
PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG
17560 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
Note: Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior notice.
33
Page 34
[d] KM-1600SRH3
APPROXIMATE ICE
PRODUCTION PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts 100/38
APPROXIMATE WATER
CONSUMPTION P ER 24 HR.
gal./day m3/day 100/38 552 2.09 423 1.60 330 1.25
FREEZING CYCLE TIME
min. 100/38
HARVEST CYCLE TIME
min. 100/38
HEA D PRE SSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG kg/cm2G 100/38 39 2.7 41 2.9 47 3.3
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27 1442 654 1403 636 1311 595
90/32 1436 651
100/38 1409 639 1355 615 1213 550
70/21
80/27
90/32
70/21
80/27 698 2.64 544 2.06 505 1.91
90/32 674 2.55
70/21
80/27
90/32
70/21
80/27
90/32
70/21
80/27 233 16.4 249 17.5 267 18.8
90/32 235 16.5
100/38 240 16.8 264 18.6 295 20.7
70/21
80/27 38 2.6 39 2.7 43 3.0
90/32 38 2.7
50/10 70/21 90/32
1461
2775
2795
2801
2816
773
25
25
26
26
5.5
4.9
4.8 2.7
3.9
225
37
W ATER TEMP. (ºF/ º C)
663 1436 651 1365 619
1375
2.93
15.8
2.6 38 2.7 41 2.9
674 2.55 601 2.27
436
235 16.5 252 17.7
260
40
624
2801
2836
2865
2877
1.65
26
26
27
27
4.8
3.8
3.0
2.9
18.3
2.8
1291 585
2851
2893
2920
2970
381 1.44
27
29
29
31
4.3
3.7
2.5
278 19.6
44 3.1
TOTAL HEAT OF REJECTION FROM CONDENSER 22000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR 3450 BTU/h [AT 90ºF (32ºC) / W T 70ºF (21ºC)]
CONDENSER VOLUME 214 CU. IN (URC-20F)
Note: Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior notice.
34
Page 35
IV. Service Diagnosis
1. No Ice Production
Problem Possible Cause Remedy
The icemaker will not
[1] a) Power Supply 1. OFF position. 1. Move to ON position.
start.
b) Fuse (Inside fused
disconnect, if any)
c) Control Switch 1. OFF position. 1. Move to ICE position.
d) Bin Control Thermostat 1. Tripped with bin filled with
e) High Pressure Control 1. Bad c ontacts. 1. Check for continuity and
f) Transformer 1. Thermal fuse blown or coil
g) Wiring to Controller
Board
h) Thermistor 1. Leads short-circuit or open
i) Hot Gas Solenoid
Valve
2. Loose connection. 2. Tighten.
3. Bad contacts. 3. Check for continuity and
replace.
4. Voltage too high. 4. Check and get
recommended voltage.
1. Blown. 1. Check for short circuit and
replace.
2. Bad contacts. 2. Check for continuity and
replace.
1. Remove ice.
ice.
2. Ambient temperature too
cool.
3. Set too warm. 3. See "II.2.[d] Controls and
4. Bulb out of position. 4. Place in position.
5. Bad contacts or leaks in
bulb.
winding opened.
1. Loose connections or
open.
and high temperature
safety operates.
1. Continues to open in
freeze cycle and high
temperature safety
operates.
2. Increase ambient
temperature.
Adjustments, 6) Bin
Control."
5. Check for continuity and
replace.
replace.
1. Replace.
1. Check for continuity and
replace.
1. See "II.2.[d] Controls and
Adjustments, 1) Defrost
Control."
1. Check for power off in
freeze cyc le and replace.
35
Page 36
Problem Possible Cause Remedy
[1] Continued from
previous page.
Water continues to
[2] a) Float Switch 1. Connector disconnected. 1. Place in position.
be supplied, and the
icemaker will not
start.
[3] a) Wash Switch 1. WASH position. 1. Move to ICE position.
Compressor will not
start or stops
operating.
j) Water Supply Line 1. Water supply off and water
supply cycle does not
finish.
2. Condenser water pressure
too low or off and pressure
control opens and closes
frequently to finally
operate high temperature
safety.
k) Water Solenoid 1. Mesh filter or orifice gets
clogged and water supply
cycle does not finish.
2. Coil winding opened. 2. Replace.
3. Wiring to water valve. 3. Check for loos e
l) Controller Board 1. Defective. 1. See "II.2[e] Checking the
Interlock Switch
m) 1. OFF Position 1. Move to ON position.
(Cleaning Valve)
b) Controller Board 1. Defec tive. 1. Replace.
c) Contactor 1. Open coil or contacts
b) High Pressure
Controller
2. Bad contacts. 2. Check for continuity and
2. Leads opened or defective
switch.
3. Float does not move
freely.
worn.
2. Bad contacts. 2. Check and replace.
1. Dirty air filter or
condenser.
2. Ambient or condenser
water temperature too
warm.
3. Refrigerant overcharged. 3. Recharge.
4. Refrigerant line or
components plugged.
5. Fan not operating. [Except
water-cooled model]
6. Condenser water pressure
too low or off. [Watercooled model only]
1. Check and get
recommended pressure.
2. Check and get
recommended pressure.
1. Clean.
connection or open, and
replace.
Controller Board."
replace.
2. Check and replace.
3. Clean or replace.
1. Replace.
1. Clean.
2. Reduce temperature.
4. Clean and replace drier.
5. See chart 1.[6]
6. Check and get
recommended pressure.
36
Page 37
Problem Possible Cause Remedy
-
Continued from
[3] c) Overload Protector 1. Bad contacts. 1. Check for continuity and
previous page.
2. Voltage too low. 2. Increase voltage.
3. Refrigerant overcharged or
undercharged.
4. Line valve continues to
close in freeze cycle and
overload protector
operates.
d) Starter 1. Bad c ontacts. 1. Check and replace.
2. Coil winding opened. 2. Replace.
e) Start Capacitor or Run
Capacitor
f) Magnetic Contactor 1. Bad contacts. 1. Check for continuity and
g) Compressor 1. Wiring to c ompressor. 1. Check for loose
h) Controller Board 1. Defective. 1. See "II.2[e] Checking the
i) Water Regulator [Water
cooled model only]
Water continues to
[4] a) Water Solenoid Valve 1. Diaphragm does not close. 1. Check for water leaks with
be supplied in freeze
cycle.
[5] a) Water Supply Line 1. Water pressure too low
No water comes from
spray tubes. Water
pump will not start, or
freeze cycle time is
too short.
b) Controller Board 1. Defective. 1. See "II.2[e] Checking the
b) Water Solenoid Valve 1. Dirty mesh filter or orifice
c) Water System 1. Water leaks. 1. Check connections for
1. Defective. 1. Replace.
2. Coil winding opened. 2. Replace.
2. Defective. 2. Replace.
3. Protector tripped. 3. Reduce temperature.
1. Set too high. 1. Adjust lower.
and water level in water
tank too low.
and water level in water
tank too low.
2. Clogged. 2. Clean.
3. Pump out check valve
leaking by.
replace.
3. Recharge.
4. Check line valve's
operation in freeze cycle
and replace.
replace.
connection or open, and
replace.
Controller Board."
icemaker off.
Controller Board."
1. Check and get
recommended pressure.
1. Clean.
water leaks, and replace.
3. Check assembly and
clean.
37
Page 38
Problem Possible Cause Remedy
Continued from
[5] d) Pump Motor 1. Motor winding opened. 1. Replace.
previous page.
e) Controller Board 1. Defective. 1. See "II.2[e] Checking the
Fan Motor will not
[6] a) Fan Motor 1. Motor winding opened. 1. Replace.
start, or is not
operating.
b) Controller Board 1. Defective. 1. See "II.2[e] Checking the
All components run,
[7] a) Refrigerant 1. Undercharged. 1. Check for leaks and
but no ice is
produced.
b) Compressor 1. Defective valve. 1. Replace.
c) Hot Gas Solenoid
Valve
d) Line Valve 1. Continues to close in
e) Water Solenoid Valve 1. Water solenoid valve is
f) Water Supply Line
[Water-cooled model
only]
2. Bearing worn out. 2. Replace.
3. Wiring to pump motor. 3. Check for loose
connection or open, and
replace.
4. Defective capacitor. 4. Replace.
5. Defective or bound
impeller.
6. Mechanical seal worn out. 6. Check and replace.
2. Bearing worn out. 2. Replace.
3. Wiring to fan motor. 3. Check for loose
4. Defective capacitor. 4. Replace.
5. Fan blade bound. 5. Check and replace.
2. Air or moisture trapped. 2. Replace drier and
1. Continues to open in
freeze cycle.
freeze cycle.
wide open during freeze.
1. Condenser water pressure
too low or off and pressure
control opens and closes
frequently.
5. Replace and clean.
Controller Board."
connection or open, and
replace.
Controller Board."
recharge.
recharge.
1. Check and replace.
1. Check and replace.
1. Chec k for water leaks with
icemaker off.
1. Check and get
recommended pressure.
38
Page 39
2. Evaporator is Frozen Up
Problem Possible Cause Remedy
Freeze cycle time is
[1] a) Float Switc h 1. Leads short-circuit or
too long.
b) Water Solenoid Valve 1. Diaphragm does not close. 1. Check for water leaks with
c) Controller Board 1. Defective. 1. See "II.2[e] Checking the
All ice formed on
[2] a) Evaporator 1. Scaled up. 1. Clean.
evaporator does not
fall into bin in harvest
cycle.
[3] Other a) Spray Tubes 1. Clogged. 1. Clean
b) Water Supply Line 1. Water pressure too low. 1. Check and get
c) Water Filter System 1. Dirty/Restricted 1. Replace filter.
d) Water Solenoid Valve 1. Dirty mesh filter or orifice. 1. Clean.
e) Ambient and/or water
temperature.
f) Line Valve 1. Continues to open in
g) Thermistor 1. Out of position or loose
h) Controller Board 1. Defrost timer is set too
b) Water System 1. Dirty. 1. Clean.
c) Refrigerant 1. Undercharged. 1. Check for leaks and
d) Expansion Valve 1. Bulb out of position or
e) 1. Coil winding opened. 1. Replace.
Hot Gas Solenoid
Valve
f) Water Supply Line 1. Too small; requires 1/2"
g) Water Filter 1. Flow rate too small. 1. Replace with filter that has
defective switch.
2. Float does not move
freely.
2. Diaphragm does not close. 2. Check for water leaks with
1. Too cool. 1. Increase temperature.
harvest cycle.
attachment.
short.
2. Defective. 2. See "II.2[e] Checking the
2. Out of position. 2. Place in position.
loose attachment.
2. Defective. 2. Replace.
2. Plunger does not move. 2. Replace.
3. Wiring to hot gas valve. 3. Check for loose
OD line dedicated per
machine.
1. Check and replace.
2. Clean or replace.
icemaker off.
Controller Board."
recommended pressure.
icemaker off.
1. Check operation in harvest
cycle and replace.
1. See "V.11. Removal and
Replac ement of
Thermistor."
1. Adjust longer, referring to
"II.2.[d] Controls and
Adjustments, 2) Defrost
Timer."
Controller Board."
recharge.
1. Place in position.
connection or open, and
replace.
1. Increase water line size.
larger flow rate.
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3. Low Ice Production
Problem Possible Cause Remedy
Freeze cycle time is
[1] a)
long.
Harvest cycle time is
[2]
long.
See chart 1.[3] and check high pressure controller and water regulator.
b)
See chart 2.[1] and check float switch, water solenoid valve and controller board.
a)
See chart 2.[2] and check evaporator, water supply line, water filter system, water
solenoid valve, ambient and/or water temperature, line valve, thermistor, and
controller board.
4. Abnormal Ice
Problem Possible Cause Remedy
[1] Small cubes. a) Ice Cube Guide 1. Out of position. Circulated
water falls into bin.
See chart 1.[5] and check water supply line, water solenoid valve, water system,
b)
pump motor, and controller board.
[2] Cloudy or irregular
cubes.
c) Pump Out Check
Valve
See chart 2.[1] and 2.[3], and check float switch, water solenoid valve, controller
a)
board, spray tubes, water system, refrigerant charge, and expansion valve.
b) Spray Guide
c) Water Quality 1. High hardness or contains
1. Dirty. 1. Clean.
1. Dirty. 1. Clean.
impurities.
1. Place in position.
1. Install a water softener or
filter.
5. Other
Problem Possible Cause Remedy
[1] a) Bin Control Thermostat 1. Set too cold. 1. Adjust warmer.
Icemaker will not
stop when bin is filled
with ice.
Abnormal noise.
[2]
[3] a) Bin Drain 1. Plugged. 1. Clean.
Ice in storage bin
often melts .
a) Pump Motor 1. Bearings worn out. 1. Replace.
b) Fan Motor 1. Bearings worn out. 1. Replace.
c) Compressor 1. Bearings worn out or
d) Refrigerant Lines 1. Rub or touch other lines or
b) Icemker and Bin 1. Drains not run separately. 1. Separate the drain lines.
2. Defective. 2. Replace.
2. Fan blade deformed. 2. Replace fan blade.
3. Fan blade does not move
freely.
cylinder valve broken.
2. Mounting pad out of
position.
surfaces.
3. Replace.
1. Replace.
2. Reinstall.
1. Replace.
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V. Removal and Replacement of Components
IMPORTANT
Ensure all components, fasteners and thumbscrews are securely in place after
the equipment is serviced.
IMPORTANT
1. The Polyol Ester (POE) oils used in R-404A units can absorb moisture
quickly. Therefore it is important to prevent moisture from entering the system
when replacing or servicing parts.
2. Always install a new filter drier every time the sealed refrigeration system is
opened.
3. Do not leave the system open for longer than 5 minutes when replacing or
servicing parts.
1. Service for Refrigerant Lines
[a] Refrigerant Recovery
The icemaker unit is provided with two refrigerant access valves – one on the low-side and
one on the high-side line. Using proper refrigerant practices recover the refrigerant from the
access valves and store it in an approved container. Do not discharge the refrigerant into
the atmosphere.
[b] Evacuation and Recharge [R-404A]
1) Attach charging hoses, a service manifold and a vacuum pump to the system. Be sure to
connect charging hoses to both high and low -side access valves.
IMPORTANT
The vacuum level and vacuum pump may be the same as those for current
refrigerants. However, the rubber hose and gauge manifold to be used for
evacuation and refrigerant charge should be exclusively for POE oils.
2) Turn on the vacuum pump. Never allow the oil in the vacuum pump to flow backward.
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.
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4) Close the low-side valve and high-side valve on the service manifold.
5) Disconnect the vacuum pump and attach a refrigerant service cylinder to the high-side line.
Remember to loosen the connection and purge the air from the hose. For water-cooled
models, see the nameplate for the required refrigerant charge. For remote air-cooled models,
see the charge label in the machine compartment. Hoshizaki recommends only virgin
refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used.
6) A liquid charge is recommended for charging an R-404A system. Invert the service cylinder.
Open the high-side, service manifold valve.
7) Allow the system to charge with liquid until the pressures balance.
8) If necessary, add any remaining charge to the system through the low-side. Use a throttling
valve or liquid dispensing device to add the remaining liquid charge through the low-side
access port with the unit running.
9) Close the two refrigerant access valves, and disconnect the hoses and service manifold.
10) Cap the access valves to prevent a possible leak.
2. Brazing
DANGER
1. Refrigerant R-404A itself is not flammable at atmospheric pressure and
temperatures up to 176° F.
2. Refrigerant R-404A itself is not explosive or poisonous. However, when exposed
to high temperatures (open flames) R-404A can be decomposed to form
hydrofluoric acid and carbonyl fluoride both of which are hazardous.
3. Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
4. Do not use silver alloy or copper alloy containing arsenic.
5. Do not use R-404A as a mixture with pressurized air for leak testing. Refrigerant
leaks can be detected by charging the unit with a little refrigerant, raising the
pressure with nitrogen and using an electronic leak detector.
Note: All brazing-connections inside the evaporator case are clear-paint coated. Sandpaper
the brazing connections before unbrazing the components. Use a good abrasive cloth
to remove coating.
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3. Removal and Replacement of Compressor
IMPORTANT
Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repair or replacement has been
made.
Note: When replacing a compressor with a defective winding, be sure to install the new
start capacitor and start relay supplied with the replacement compressor. Due to
the ability of the POE oil in the compressor to absorb moisture quickly, the
compressor must not be opened more than 15 minutes for replacement or service.
Do not mix lubricants of different compressors even if both are charged with
R-404A, except when they use the same lubricant.
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the terminal cover on the compressor and disconnect the compressor wiring.
5) Remove the discharge and suction pipes using brazing equipment.
6) Remove the hold-down bolts, washers and rubber grommets.
7) Slide and remove the compressor. Unpack the new compressor package. Install the new
compressor.
8) Attach the rubber grommets of the prior compressor.
9) Sandpaper the suction, discharge and process pipes.
10) Place the compressor in position and secure it using the bolts and washers.
11) Remove plugs from the suction, discharge and process pipes.
12) Braze the process, suction and discharge lines (Do not change this order), while
purging with nitrogen gas flowing at the pressure 3-4 PSIG.
13) Install the new filter drier.
14) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
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15) Evacuate the system, and charge it with refrigerant. For water-cooled models, see the
nameplate for the required refrigerant charge. For remote air-cooled models, see the
charge label in the machine compartment.
16) Connect the terminals and replace the terminal cover in its correct position.
17) Replace the panels in their correct positions.
18) Turn on the power supply.
4. Removal and Replacement of Drier
IMPORTANT
Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repair or replacement has been
made.
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the drier.
5) Install the new drier with the arrow on the drier in the direction of the refrigerant flow. Use
nitrogen gas at the pressure of 3-4 PSIG when brazing the tubings.
6) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
7) Evacuate the system, and charge it with refrigerant. For water-cooled models, see the
nameplate for the required refrigerant charge. For remote air-cooled models, see the
charge label in the machine compartment.
8) Replace the panels in their correct positions.
9) Turn on the power supply.
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5. Removal and Replacement of Expansion Valve
IMPORTANT
Sometimes moisture in the refrigerant circuit exceeds the drier capacity and
freezes up at the expansion valve. Always install a new drier every time the
sealed refrigeration system is opened. Do not replace the drier until after all
other repair or replacement has been made.
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the insulation and the expansion valve bulb on the suction line.
5) Remove the expansion valve cover, and disconnect the expansion valve using
brazing equipment.
6) Braze the new expansion valve, with nitrogen gas flowing at a pressure of 3-4 PSIG.
WARNING
1. Do not heat the wall. Place a steel barrier for protection.
2. Always protect the valve body by using a damp cloth to prevent the valve from
overheating. Do not braze with the valve body exceeding 250°F.
7) Install the new drier.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system, and charge it with refrigerant. For water-cooled models, see the
nameplate for the required refrigerant charge. For remote air-cooled models, see the
charge label in the machine compartment.
10) Attach the bulb to the suction line in position. Be sure to secure it with clamps and to
insulate it.
11) Place the new set of expansion valve covers in position.
12) Replace the panels in their correct position.
13) Turn on the power supply.
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6. Removal and Replacement of Hot Gas Valve and Line Valve
CAUTION
Always use a copper tube of the same diameter and length when replacing the
hot gas lines; otherwise the performance may be reduced.
IMPORTANT
Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repair or replacement has been
made.
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the screw and the solenoid.
5) Disconnect the hot gas valve or line valve using brazing equipment.
6) Install the new valve.
WARNING
Always protect the valve body by using a damp cloth to prevent the valve from
overheating. Do not braze with the valve body exceeding 250°F.
7) Install the new drier.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system and charge it with refrigerant. For water-cooled models, see the
nameplate for the required refrigerant charge. For remote air-cooled models, see the
charge label in the machine compartment.
10) Cut the leads of the solenoid allowing enough lead length to reconnect using closed end
connectors.
11) Connect the new solenoid leads.
12) Attach the solenoid to the valve body, and secure it with a screw.
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13) Replace the panels in their correct positions.
14) Turn on the power supply.
7. Removal and Replacement of Evaporator
IMPORTANT
Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repair or replacement has been
made.
1) Turn off the power supply.
2) Remove the panels and the top insulation over the evaporator.
3) Recover the refrigerant and store it in an approved container.
4) Remove the spray tubes and the insulations at the “U” shaped notch where the
refrigeration tubings pass through the molded chassis.
5) Remove the insulation tube and disconnect the evaporator inlet tubing at the tee next to
the expansion valve.
6) Lift up the evaporator, and disconnect the evaporator outlet tubing.
7) Install the new evaporator.
8) Install the new drier.
9) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
10) Evacuate the system, and charge it with refrigerant. For water-cooled models, see the
nameplate for the required refrigerant charge. For remote air-cooled models, see the
charge label in the machine compartment.
11) Replace the removed parts in the reverse order of which they were removed.
12) Replace the top insulation and the panels in their correct positions.
13) Turn on the power supply.
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8. Removal and Replacement of Water Regulating Valve - Water-Cooled Model Only
IMPORTANT
Always install a new drier every time the sealed refrigeration system is
opened. Do not replace the drier until after all other repair or replacement has
been made.
1) Turn off the power supply.
2) Close the water supply line shut-off valve.
3) Remove the panels.
4) Recover the refrigerant and store it in an approved container.
5) Disconnect the capillary tube at the condenser outlet using brazing equipment.
6) Disconnect the flare-connections of the valve.
7) Remove the screws and the valve from the bracket.
8) Install the new valve, and braze the capillary tube.
9) Install the new drier.
10) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
11) Evacuate the system and charge it with refrigerant. See the nameplate for the
required refrigerant charge.
12) Connect the flare-connections.
13) Open the water supply line shut-off valve.
14) Check for water leaks.
15) Replace the panels in their correct positions.
16) Turn on the power supply.
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9. Adjustment of Water Regulating Valve - Water-Cooled Model Only
The water regulating valve (also called “water regulator”) is factory-adjusted. No adjustment
is required under normal use. Adjust the water regulator, if necessary, using the following
procedure:
1) Attach a pressure gauge to the high-side line of the system. Or prepare a
thermometer to check for the condenser drain temperature.
2) Rotate the adjustment screw by using a flat blade screwdriver, so that the pressure gauge
shows 270 PSIG or the thermometer reads 104–115° F, 5 minutes after a freeze cycle or
icemaking process starts. When the pressure exceeds 270 PSIG, or the condenser drain
temperature exceeds 115° F, rotate the adjustment screw counterclockwise. See Fig. 1.
3) Check that the pressure or the condenser drain temperature holds a stable setting.
Fig. 1
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10. Removal and Replacement of Condensing Pressure Regulator (C.P.R.)
- Remote Air-Cooled Model Only
IMPORTANT
Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repair or replacement has been
made.
1) Turn off the power supply.
2) Remove the panels from the remote condenser unit.
3) Recover the refrigerant and store it in an approved container.
4) Before heating, break off the stub on the dome to release the dome charge.
5) Disconnect the C.P.R. using brazing equipment.
6) Install the new C.P.R. Use nitrogen gas at a pressure of 3-4 PSIG when brazing the
C.P.R.
WARNING
Always protect the C.P.R. body by using a damp cloth to prevent the C.P.R. from
overheating. Do not braze with the C.P.R. body exceeding 250°F.
7) Install the new drier in the icemaker.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system and charge it with refrigerant. See the charge label in the machine
compartment in the icemaker.
10) Replace the panels in their correct positions.
11) Turn on the power supply.
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11. Removal and Replacement of Thermistor
CAUTION
1. Fragile, handle very carefully.
2. Always use a recommended sealant (high thermal conductive type), Model
KE4560RTV manufactured by Shinetsu Silicone, Part Code 60Y000-11, or
Part Code 4A0683-01 equivalent.
3. Always use a recommended foam insulation (non-absorbent type) or
equivalent.
1) Turn off the power supply.
2) Remove the panels.
3) Remove the control box cover.
4) Disconnect the thermistor leads from
the K3 connector on the controller board.
5) Remove the plastic cable ties, foam
insulation, thermistor holder and
thermistor. See Fig. 2.
6) Scrape away the old sealant on the
thermistor holder and the suction pipe.
7) Wipe off moisture or condensation on the suction pipe.
8) Smoothly apply recommended sealant (KE4560RTV, Part Code 60Y000-11 or
4A0683-01) to the thermistor holder concave.
Thermistor Lead Cable Tie
Foam Insulation Thermistor Holder
Fig. 2
9) Attach the new thermistor to the suction pipe very carefully to prevent damage to
the leads. And secure it using the thermistor holder and recommended foam
insulation.
10) Secure the insulation using the plastic cable ties.
11) Connect the thermistor leads through the bushing of the control box to the K3 connector
on the controller board.
Note: Do not cut the leads of the thermistor while installing it.
12) Replace the control box cover and the panels in their correct positions.
13) Turn on the power supply.
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12. Removal and Replacement of Fan Motor
Note: When replacing a fan motor with defective winding, it is recommended that a new
capacitor be installed.
1) Turn off the power supply.
2) Remove the panels.
3) Remove the junction box cover from the remote condenser unit (remote air-cooled
model).
4) Remove the closed end connectors from the fan motor leads.
5) Remove the fan motor bracket and fan motor.
6) Install the new fan motor, and replace the removed parts in the reverse order of which
they were removed.
7) Replace the panels in their correct positions.
8) Replace the junction box cover in its correct position (remote air-cooled model).
9) Turn on the power supply.
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13. Removal and Replacement of Water Valve
1) Turn off the power supply.
2) Close the water supply line shut-off valve.
3) Remove the front panel.
4) Remove the valve outlet tubing by releasing the clamp.
5) Remove the bracket from the unit.
6) Remove the fitting nut and water valve.
7) Disconnect the terminals from the water valve.
8) Install the new water valve, and replace the removed parts in the reverse order of which
they were removed.
9) Open the water supply line shut-off valve.
10) Turn on the power supply.
11) Check for leaks.
12) Replace the front panel in its correct position.
14. Removal and Replacement of Pump Motor
1) Turn off the power supply.
2) Remove the front panel.
3) Drain the water tank by removing the insulation panel
and the cap at the front of the ice dropping hole.
See Fig. 3.
4) Replace the removed parts in their correct positions.
5) Disconnect the pump suction and discharge hoses.
6) Remove the screws and the pump motor bracket.
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Fig. 3
Page 54
7) Remove the closed end connectors from the pump motor leads.
8) Remove the two screws and the pump motor bracket.
9) Remove the pump housing and check the impeller.
10) If the impeller is defective, install a new impeller.
11) Install the new motor or new parts, and replace the removed parts in the reverse
order of which they were removed.
12) Turn on the power supply and check for leaks.
13) Replace the front panel in its correct position.
15. Removal and Replacement of Spray Tubes
1) Turn off the power supply.
2) Remove the front panel and the insulation panel.
3) Remove the rubber hoses from the spray tubes (water supply pipe).
4) Release the clamps and disconnect the rubber hoses.
5) Remove the spray tubes by squeezing the side tabs.
6) Install the new spray tubes, and replace the removed parts in the reverse order of which
they were removed.
7) Replace the panels in their correct positions.
8) Turn on the power supply.
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VI. Maintenance and Cleaning Instructions
IMPORTANT
Ensure all components, fasteners and thumbscrews are securely in place after
any maintenance or cleaning is done to the equipment.
1. Preparing the Icemaker for Long Storage
WARNING
When shutting off the icemaker for an extended time, drain out all water from
the water tank and remove the ice from the storage bin. The storage bin should
be cleaned and dried. Drain the icemaker to prevent damage to the water
supply line at sub-freezing temperatures, using air or carbon dioxide. Shut off
the icemaker until the proper ambient temperature is resumed.
Note: When the icemaker is not used for two or three days, it is sufficient to only move
the control switch to the “OFF” position, unless the icemaker will be at subfreezing temperatures.
[1] On water-cooled model only, first remove the water from the water-cooled condenser:
1) Remove the front panel.
2) Move the control switch on the control box to the “OFF” position.
3) Wait 3 minutes.
4) Move the control switch to the “ICE” position.
5) Allow 5 minutes for the icemaker to fill with water and the water pump to start
operating.
6) Close the water-cooled condenser water supply line shut-off valve.
7) Open the drain valve for the water-cooled condenser water supply line.
8) Allow the line to drain by gravity.
9) Attach compressed air or carbon dioxide supply to the condenser water line drain valve.
10) Quickly blow the water-cooled condenser out using compressed air or carbon dioxide
until water stops coming out.
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[2] Remove the water from the potable water supply line:
1) Remove the front panel. (Except water-cooled model)
2) Move the control switch on the control box to the “OFF” position.
3) Wait 3 minutes.
4) Close the potable water supply line shut-off valve and open the potable water supply
line drain valve.
5) Allow the line to drain by gravity.
6) Attach compressed air or carbon dioxide supply to the potable water line drain valve.
7) Move the control switch to the “ICE” position.
8) Blow the potable water line out using compressed air or carbon dioxide.
[3] Drain the potable water tank:
1) Turn off the power supply.
2) Move the control switch to the “OFF”
position.
3) Drain the water tank by removing the
insulation panel and the cap located
on the front bottom part of the ice
dropping hole. See Fig. 4.
4) Replace the removed parts in their
correct positions.
5) Remove all ice from the storage bin,
and clean the storage bin.
6) Replace the front panel in its correct
position.
7) Close the drain valve.
Fig. 4
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2. Cleaning and Sanitizing Procedures
IMPORTANT
Ensure all components, fasteners and thumbscrews are securely in place after
any maintenance or cleaning is done to the equipment.
WARNING
1. HOSHIZAKI recommends cleaning this unit at least once a year. More
frequent cleaning, however, may be required in some existing water
conditions.
2. To prevent injury to individuals and damage to the icemaker, do not use
ammonia type cleaners.
3. Always wear liquid-proof gloves to prevent the cleaning and sanitizing
solutions from coming into contact with skin.
IMPORTANT
1. The cleaning valve is used to allow solution flow to the inside of the
evaporator during the cleaning and sanitizing operation. It should be closed
for all icemaking operation. The compressor will not operate unless this valve
is completely closed.
2. To open the cleaning valve, the valve handle should be parallel to the valve
body. To close the valve, the valve handle should be at a right angle to the
valve body.
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[a] Cleaning Procedure
1) Dilute 27 fl. oz. of the recommended cleaner Hoshizaki “Scale Away” or “LIME-A-WAY”
(Economics Laboratory, Inc.) with 5 gal. of water.
2) Remove all ice from the evaporator and the storage bin.
Note: To remove cubes on the evaporator, turn off the power supply and turn it on after
3 minutes. The defrost cycle starts and the cubes will be removed from the
evaporator.
3) Turn off the power supply.
4) Remove the front panel and then remove the insulation panel by first removing the
thumbscrew, lifting the panel slightly and pulling it toward you.
5) Drain the water tank by removing the cap located on the front bottom part of the ice
dropping hole. See Fig. 4.
6) After tank has drained, replace the removed parts in their correct positions.
7) Pour the cleaning solution into the water tank.
8) Fully open the cleaning valve on the left side wall of the machine compartment.
9) Move the control switch on the control box to the “WASH” position.
10) Replace the insulation panel and the front panel in their correct positions.
11) Turn on the power supply, and start the washing process.
12) Turn off the power supply after 30 minutes.
13) Remove the front panel and the insulation panel.
14) Drain the water tank. (See step 5 above).
15) Replace the cap and the insulation panel in their correct positions.
16) Move the control switch to the “ICE” position.
17) Close the cleaning valve.
Note: The icemaker will not operate unless the cleaning valve is completely closed.
18) Replace the front panel in its correct position.
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19) Turn on the power supply to fill the water tank with water.
20) Turn off the power supply after 3 minutes.
21) Remove the front panel, and fully open the cleaning valve.
22) Move the control switch to the “WASH” position.
23) Replace the front panel in its correct position.
24) Turn on the power supply to rinse off the cleaning solution.
25) Turn off the power supply after 5 minutes.
26) Remove the front panel and insulation panel.
27) Drain the water tank by removing the cap located on the front bottom part of the ice
dropping hole. See Fig. 4.
28) After the tank has drained, replace the removed parts in their correct positions.
Note: Do not replace the insulation panel when you proceed to “[b] Sanitizing
Procedure.”
29) Repeat the above steps 16) through 28) three more times to rinse thoroughly.
Note: If you do not sanitize the icemaker, go to step 9) in “[b] Sanitizing Procedure.”
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[b] Sanitizing Procedure - Following Cleaning Procedure
1) Dilute a 5.25% sodium hypochlorite solution (chlorine bleach) with water (Add 2.5 fl. oz.
of sanitizer to 5 gal. of water).
2) Remove the insulation panel, if it is in its normal position.
3) Pour the sanitizing solution into the water tank.
4) Replace the insulation panel and the front panel in their correct positions.
Note: Make sure that the control switch is in the “WASH” position and the cleaning valve
is in the “OPEN” position.
5) Turn on the power supply, and start the sanitizing process.
6) Turn off the power supply after 15 minutes.
7) Remove the front panel and, if necessary, the insulation panel.
8) Drain the water tank. See the step 5) in “[a] Cleaning Procedure.”
9) Replace the removed parts and the insulation panel in their correct positions.
10) Repeat steps 16) through 28) in “[a] Cleaning Procedure” two times to rinse thoroughly.
11) Close the cleaning valve.
12) Move the control switch to the “ICE” position.
13) Replace the front panel in its correct position.
14) Clean the storage bin with water.
15) Turn on the power supply, and start the automatic icemaking process.
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3. Maintenance
IMPORTANT
This icemaker must be maintained individually, referring to the instruction
manual and labels provided with the icemaker.
1) Stainless Steel Exterior
To prevent corrosion, wipe the exterior occasionally with a clean and soft cloth. Use a
damp cloth containing a neutral cleaner to wipe off oil or dirt build up.
2) Storage Bin and Scoop
• Wash your hands before removing ice. Use the plastic scoop provided.
• The storage bin is for ice use only. Do not store anything else in the bin.
• Keep the scoop clean. Clean it by using a neutral cleaner and rinse thoroughly.
• Clean the bin liner by using a neutral cleaner. Rinse thoroughly after cleaning.
3) Condenser (Except water-cooled model)
Check the condenser once a year, and clean if required by using a brush or vacuum
cleaner. More frequent cleaning may be required depending on the location of the
icemaker.
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